Attachment for dental and similar chairs



. l, 1931. w. v. HAGBERG ATTACHMENT FOR DENTAL AND SIMILAR CHAIRS Original Filed Feb. 18, '1928 gbery.

1 Warn er V Ha Ki torn e513.

Patented Dec. 1, 1931 T l-ti f?- WARNER v. HAGIBERG, F mNEAPOLIS, MIN ESOTA ATTACHMENT For. nEN'rAnAnn simrnAncrrAIns Application filed February 18,1928, Seria1 1 1'o., 2 55 ,307. Titer rev ed Maren 6.193;-

My invention relates to attachments for dental and similar chairs. Heretofore it has.

been customary to employ separate stools for use by the operator when he wishes to sit down while working on a person occupying the chair. Such stools if kept where they are readily available for use when desired are often in the way .and are liable to be knocked over. An object, therefore, of my invention is to provide a seat which is pivotally attached to the chair so that it may be readily swung back out of the way when not in use and the position of which can be readily changed so as to best suit the convenience of the operator. Another object is to provide a device of this character which may be readily attached to existing forms of chairs.

The full objects and advantages of my in-.

vention will appear in connection with the detailed description thereof, and the novel features of my inventive idea will be particularly pointed out'in the claims.

In the accompanying drawings which illustrate some of the forms in which my invention may be embodied,- 1

Fig. 1 is a perspective view of a dental chair showing my attachment applied thereto. Fig. 2 is a plan view on an'enlargedvscale of one form of the device applied to a chair. Fig. 3 is a view in section on the line 3-3 of Fig. 2. V Fig. 4 is a view in section on the line 44 of Fig. 2. Fig. 5 is a view in section on the line 5-5 of Fig. 2. Fig. 6 is a sectional view of a modified construction. Fig.7 is a the seat frame having beenremoved. Fig. 8 is a view in section on the line 88 of Fig. 7. Referring to the drawings and first more particularly to Figs. 1 to 5, the'numeral .10 designates the rotatable column or pedestal of acustomary dental chair, this column having a bellshaped member l2rigid with the top thereof. Projections14 extend out at diametrically opposite places from the periphery of the member 12. The ends ofthe pro-' jections 14 are provided with trunnion's 16 upon which are tiltably mounted bearing members 18 which are customarily secured to the seat frame 20 by bolts. It will be notedthat the projections 14 constitute trunnion plan view of another modified construction,

sup-ports; In ardent apply device. the

aforesaid bolts are removed and replaced longer bolts} 22, these latter bo'lts extending through a casting 24 which constitutes a per tion of my'attachmenti As will be apparent from Fig. '4,'the underside o'fYthe bearing member 18 isconvexedand as will be'apparent: from Fig. 5, the projectionl lis' of channel form so that the underside is U:

shaped. The casting24 onits upper side is concaved to fit the convexed portionof th 'e.

bearing member and has recesses to receive the flanges of the'projection 14 whereby the casting will be firmly held in place when the nuts on'the bolts 22 are tightenedr Theouter end of the casting has, aperforatedfbifurca tion 26. The inner end of a seat'suppor't '28 is pivotally attached to the bifurcation means of a pin 30 passingtherethrough. The outer; endof the support .28 'is'provided' with aboss 32 containinga screwthreaded iopening which receives the threads of ascrewthreadedrod 34' to the upper end oflwhich afseat 36 is secured. In the formshown in Fig. .6,

a member-24". corresponding to ,themember 24- is formed integrally withj the-projection 14 instead of being formedseparatelythere fromjand' the casting 24 is offset downward- 1y soa's-to clear thet'runnion 16 and its bear ing'member; The seatsupport i's jattachejd' to the bifurcation 216? in the same manner-as before. Inthe form shown in Figs. Tand .8, :a casting 24- is provided which isformed sep a rately from the projection 14 but which is offset similarly to the casting 24 shown in Fig. 6. The casting 24"; at its lower end is provided with 3, lug 38 which fits between the flanges of the projection 14'and the casting is the casting is in place, a plate 41 is placed over, the projection 14. The plate 41 has perforations adapted to register with the perforations of the bosses 40. Bolts 42 passing through the registered perforations serve to hold the casting 24" firmly to the projection 14. The seat support is attached to the bifurcation 26 in the same manner as before. In this form the bearing member 18 for the trunnion 16 is held in place on the'seat frame by the original bolts which are not shown in Figs. '1 and 8.

Y The operation and advantages of my device Will be obvious in connection with the foregoing description. The operator may readily swing the seat so as to position it for working to the best advantage and may easily change the height thereof as desired. The device may be conveniently attached to chairs'already in use and when thus at tached is not in'the way of the operator as is the case with ordinary stools now employed.

Iolaim:

1. In a dental chairincluding a pedestal with trunnions and supports therefor on the upper end of said pedestal and a seat hav- 7 ing bearings tiltably mounted upon said trun- 2.;I'na dental chair including a pedestal V with trunnions and supports therefor'on the nions,"an'attachment comprisinga member A extending out from 'a trunnion support, an"

auxiliary seat support pivotally attached to ried by said seat support.

the outer end of said member, and a seat carupper end of said pedestal and a seat having bearingsitiltably mountedupon said trunnions, an attachment comprising a member extending out from a trunnion support, an auxiliary seat support pivotally attached to the outer end'of said jmember, said seat support containing a screwthreaded opening, a

screwthreaded rod engaged in said opening,

and a seat carried by the'upper end of said 7 said channel member, boltsecuring said interfitting member to said channel member, an

auxiliary seat support pivotally attached to the outer end of said interfitting member, and a seat 'ocarried by said seat support.

[Iii-testimony whereof I-hereunto afiix my.

signature.

- WARNERV'HAGBE 

